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Canon triplex a 6: first printed in 1747 (below), it appears on both versions of the portrait Haussmann made of Bach (1746, 1748 – above). In the 19th-century Bach Gesellschaft edition the canon was published in Volume 451, p. 138. In 1950 the piece was assigned the number 1076 in Schmieder's catalogue of Bach's works (BWV). The 1998 edition of that catalogue (BWV2a) mentions Haussmann's paintings as original sources for the work (p. 438), and likewise the Bach digital website gives a description of both paintings as sources for the piece (linked from Bach digital Work page 01262).The Prelude in F minor of The Well-Tempered Clavier book 1, in the BGA known as Vol. 14, p. 44, over eighty years before it was given the number 857 in the Bach-Werke-VerzeichnisThe NBA illustrates its score editions with facsimiles from manuscripts or contemporary editions: for instance NBA Series IV Volume 4 (Clavier-Übung III) contains a facsimile of the title page of the 1739 first edition of that collection.Title page of Bach's Opus 1 (Clavier-Übung I, 1731), the only time he seems to have used an opus number

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